Comparison of plant and bacterial communities between a subtropical landfill topsoil 15 years after restoration and a natural area

Xun Wen CHEN, Tsz Fung James WONG, Anna Oi-Wah LEUNG, Charles Wang-Wai NG, Ming Hung WONG

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8 Citations (Scopus)

Abstract

Engineered sanitary landfills are becoming more and more common worldwide. Ecosystem restoration of capped sanitary landfills is essential to restore the disturbed environment. Comparing plant communities, as well as bacterial communities, in landfills and natural areas, offers an efficient way to assess the restoration status. However, such studies on the restored engineered landfills are limited. Here we present an ecological restoration case in an engineered landfill in a subtropical region. Part of the South East New Territories (SENT) landfill in Hong Kong was capped and restored, by using 16 plant species growing on top of the final cover soil, during 1997–1999. In 2014, plant survey and soil properties analyses were conducted in a restored site (AT) and a natural site (CT, an undisturbed area, serving as a control). The similarity between the biota communities (i.e., plant and soil bacteria) of the two sites was assessed. Plant and soil bacterial communities at AT were significantly different (R = 1, P < 0.01, ANOSIM) from those at CT. A lower plant diversity but a higher soil bacterial diversity were observed at AT. The soil bacterial community structure was potentially driven by soil pH, moisture content, cation exchange capacity (CEC), N, and P. The engineered landfill had not been restored to an ecosystem similar to the natural environment 15 years after restoration. Establishing similar soil properties in the landfill topsoil would be important to achieve a bacterial community similar to the natural area. This study can also offer a quick and inexpensive method for landfill engineers to assess the bacterial restoration of man-made ecosystems using plant and soil properties rather than DNA analyzing techniques. Copyright © 2016 Elsevier B.V.
Original languageEnglish
Pages (from-to)49-57
JournalWaste Management
Volume63
Early online dateAug 2016
DOIs
Publication statusPublished - May 2017

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topsoil
landfill
soil property
soil
ecosystem
subtropical region
soil cover
natural area
restoration
comparison
cation exchange capacity
biota
plant community
moisture content
community structure
DNA
bacterium

Citation

Chen, X.-W., Wong, J. T.-F., Leung, A. O-W., Ng, C. W.-W., & Wong, M.-H. (2017). Comparison of plant and bacterial communities between a subtropical landfill topsoil 15 years after restoration and a natural area, 63, 49-57.

Keywords

  • Man-made ecosystem
  • Plant
  • Soil bacterial community
  • Sanitary landfill
  • Restoration
  • Nutrients cycling